When order / invoice payment is done after the order has been placed, the invoice email is sent out twice (once at confirmation and another time when marked as fully paid) due to changes introduced with #3257231: No email is sent to customer → .
Place an order using manual or on-site payment. Later mark the order or the invoice as fully paid.
Introduce a way to save the information about whether the invoice email has been sent yet and check that information before spooling invoices for mailing.
Find an elegant solution 😬...
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Could this be related to 🐛 Order onPaid event called twice RTBC ?
Seems working as expected & this implementation will allow any more complex isolated logic in future if needed.
LGTM!